Winding machine with auxiliary device for initiating the winding operation



WINDING MACHINE WITH AUXILIARY DEVICE FOR INITIATING THE WINDINGOPERATION Dec. 8, 1942. w SIEGENTHALER 2,304,712

1 Filed Aug. 5, 195a 2 sheets-$1185; 1'

Dec. 8, 1942. w. SIEGENTHALER 2,304,712

WINDING MACHINE WITH AUXILIARY DEVICE FOR INITIATING' THE WINDINGOPERATION Fi led Aug. 5, 1958 2 Sheets-Sheet 2 w lly/fling,

Patented Dec. 8, 1942 WINDING MACHINE WITH AUXILIARY DE- VICE FORINITIATING THE WINDING OP- ERATION Walter Siegenthaler, Erlenbach,Switzerland, as-

signor to the firm Scharer- Nussbaumer & 00., Erlenbach, SwitzerlandApplication August 5, 1938, Serial No. 223,369 In Switzerland October28, 1937 '7 Claims;

This invention relates to winding machines. which. are provided with anauxiliary device. for initiating the winding operation and in whichevery time on completion. of a winding the fullbobbin is removed fromthe winding position while an empty bobbin is moved into this position.

The present invention comprises improvements in the apparatus disclosedin my U. S. Patent No. 2,131,147.

According to the invention the thread or yarn is wound by means of. astationary guide in a terminal winding during the end period of thewinding operation at a point remote from the tip of the bobbin, which isaccordingly deter-- I mined, and is moved during the gyratory movementof the bobbin within the operating range of a gripper member which.deflects the yarn laterally by efiect of its own movement and thus.conveys the thread within the range of a moving thread catch by which.it is caught for then being directed onto the next bobbin to be wound...

By this means the productionof bobbins of the kind previously describedis rendered possible in simple manner, in which the terminal winding islocated in more or less close proximity to the tip of the bobbin, thatis, spaced apart from the base of the bobbin. This. facilitatesparticularly the unwinding of the end of the thread at the tip of thebobbin as compared with bobbins wound by automatons in which theterminal winding is located at the base of the bobbin and in which theunwinding of the thread at the.

retaining rings arranged. on the base is rendered more difiicult and thethread end easily tangles. 73v

with the base and is then broken.

An embodiment of the invention in the form of a cop winding machinecomprising a displace-- able and revoluble cop supporting frame isillustrated in the accompanying drawings in which Fig. 1 is anelevational view showing the position of the cop supporting frame priorto the completion of a winding;

Fig. 2 is a similar view showing the cop sup porting frame in a positionwhich it assumes in the end stage of the winding operation;

Fig. 3 is a vertical section on the lin III-II1 in Fig. 2;

Fig. 4 is an elevational view showing the cop supporting frame pushedback into initial position but still rotating;

Fig. 5 is a vertical section on the line V-V in Fig. 4; Fig. 6 is a viewsimilar to Fig. 4 except that the cop supporting frame is turnedfurther;

Fig. 7 is a. vertical section on. the line. VII-47Hv In Fig. 6

Fig. 8 is a vertical section on the line lII.

in Fig. 6;

chine frame.

Figs. 9 and 10 each show a diiferent elevation. of an example of adriving head of the winding spindle in operative condition;

Figs. 11 and 12 each show a different View of this driving head ininoperative condition, Fig.

-' 12 being a section on the line. XIIXII in Fig- 11;.

Fig. 12a is a planview of a cop tube mounted. in the driving head of aspindle;

Fig. 13 is. a partial elevation of a winding Inachine provided with suchspindle driving heads;

Fig. 14 is an elevation of a second example. of a spindle driving head;

Figs. 15 and 16 each show a section on theline XV-XV in Fig. 14 andXVIXVI in Fig. 15 respectively;

Figs. 1'7 and 18 each show a different. elevation. of a third example ofthe spindle driving head in. operative condition;

Fig. 19 is a front elevation depicting the inoperative condition of thisspindle driving head;

Figs. 20 and 21 each show a further example. of a spindle driving headinoperative condition;

Fig. 22 is a section on the line XXII-XXII in Fig. 21; and

Fig. 23 shows a front elevation of this spindle driving head ininoperative condition.

In the example represented by Figs. 1. to 8.

the cop supporting frame is provided with two face plates I, 2 which areinterconnected by a. hollow shaft 3 by means of which the cop support-'ing frame is mounted on a fixed bearing shaft 4. The cop supportingframe. is advanced step by step longitudinally of the bearing shaft 4.in the.

direction of the arrow I in Fig- 1 in a manner known per se during thebuilding of the cop with. the aid. of a feeler (not shown) in dependenceof the cop winding under formation. The, frame,- advancing means issimilar to that disclosed in my U. S. Patent No. 2,131,147, wherein itcomprises principally the motor driven screw spindle l2 and threadedcoupling member II. The face plate I has two projecting arms I, I",which extend in the plane of the platev and serve for alternatecooperation with a longitudinal rail (not shown) arranged in the lowerpart 5 of the ma- Such a rail is shown in my U. S. Patent No. 2,131,147where it is indicated by reference numeral 13.

The arm of the face plate 1 which extends downwardly cooperates with thelongitudinal rail which serves as a stop for this arm, thereby presageto the abutment I'B (Fig. 8).

venting the cop supporting frame from rotational displacement. The faceplate 2 is provided, in a manner similar to that described for the faceplate I, with two projecting arms 2, 2" which extend in the plane of theplate and serve for cooperation with the said longitudinal rail.

On the pair of plates I, 2' are mounted two winding spindles 6, 6' indiametrically opposed relation, each spindle being constructed as aroller, the roller of the upper winding spindle 6 which assumes thewinding position (Figs. 1 to 3) being rotated by bearing engagement withan endless driving belt (not shown) which passes over the same. Adriving means comprising endless belt I suitable for driving thespindles is shown in my U. S. Patent No. 2,131,147. Each one of thewinding spindles 6, 6' is provided at its end projecting beyond the faceplate I with a driving head I, I respectively provided with an innerelastic and thus resilient holding device 28, 52 (Fig. 12a) for thereception of cop tubes 8, 8' respectively the other ends of which arereceived in rigid or resilient abutments 9, 9 respectively of a counterholding device Ill. The cop tubes can be removed individually from theirmounting means by exerting pressure thereon in corresponding manner.

The counter holding device I is firmly connected to the face plate I bya tube II through which passes the bearing shaft 4 and thus forms acomponent part of the cop supporting frame. In the counter holdingdevice II) are arranged two books I2, I2 which are coordinated to thewinding spindles in diametrically opposed relation and serve astemporary stationary guides for the thread. During the operation of themachine the oncoming winding thread A passes over a thread guide I3,which corresponds to thread guide 35 of my Patent No. 2,131,147, andwhich reciprocates through a certain range corresponding to the lengthof the conical part of the cop winding in progress of formation, asindicated by the double arrow in Fig. 1. j

To each winding spindle 6, 8' is correlated a gripping member in theform of a barbed needle I4, I4 respectively the shanks of which arelongitudinally displaceably guided in the face plates I I, 2 and whichare loaded by compression springs I5, I5 respectively. As shown in Fig.1,' the barbed needle I 4 rests with its smooth end against an abutmentI6 fixed to the bearing shaft .4 and projects through a semi-circularrecess in the circumference of a disc I! which recess gives pas- Thedisc !'I against which the barbed needle I4 abuts with its smooth end,is mounted onthe cop supporting frame together with an arm I8, as isevident from Figs. 1 and 2. This arm I8 bears laterally on the lowerpart 5pof the machine frame by means of its free end. The disc I1 issecured to the hub I8 of arm I8 by any suitable means such as screws I1,and the disc I! and arm I8 are mounted for relative rotation on areduced extending bearing portion 3 of shaft 3. The arm I8, whichcorresponds to arm III in my Patent No. 2,131,147, and the disc II donot share in the rocking movements which the cop supporting frameperforms for the purpose of removing the full cop tubes from the windingposition and conveying the empty cop tubes into the winding position.

In feeding the cop supporting frame step by step in the direction ofarrow I in Fig. 1 the cop counter holding device I0 approaches the barbof.the barbed needle I 4 abutting the stationary abutment It more andmore. In the final winding phase the oncoming thread slides along thecontact hook I2 and passes through the open hook end thereinto, so that,at the corresponding points of the spool the thread is wound in someparallel windings if, after producing the winding proper, the carriageis rotated in order to change the spool at the operative (winding)position, wherein the thread lies in the elbow of the contacthook I2 andthe wound spool turns further about its own axis by reason of itsinertia, whereby a final winding of parallel threads is produced on thespool.

At the moment of completion of the cop winding proper the projecting armI of the face plate I registers with a notch in a longitudinal rail (notshown) provided in the lower part 5 of the machine frame, whereas thearm 2 of the face plate 2 registers with a corresponding notch,whereupon the cop supporting frame is rocked round the bearing shaft 4through half a revolution, preferably automatically (by means notshown),in the direction of the arrow shown in Fig. 3. The means for performingthis rocking operation is disclosed in my U. S. Patent No. 2,131,147where the belt I serves to supply the actuating force, and slottedabutment bar I3 limits th rocking movement. Simultaneously with thisrocking movement the cop supporting frame is longitudinally displacedrelative to the bearing shaft 4 by spring action, whereby it is returnedinto initial position. The means for performing this longitudinal returnmovement is disclosed in my U. S. Patent No. 2,131,147, wherein itcomprises principally spring I9 and arm II).

By effect of this rocking movement of the cop supporting frame thewinding spindle B is rocked out of the winding position together withthe full cop 8 and instead the winding spindle B carrying an empty coptube 8 is rocked into this position in which it is immediately driven bythe endless driving belt by frictional engagement therewith. The rockingmovement of the cop supporting frame during which thecop tubes 8, 8perform a gyrating movement is limited by the arms I" and 2" of the faceplates I, 2 hitting the above-mentioned lower longitudinal rail (notshown), whereby the cop supporting frame is secured in its new positionof adjustment at the same time. I

Prior to the beginning of the rocking movement of the cop supportingframe the barbed needle I4 will have been ejected by cooperation of itssmooth end with the abutment I6 through the semi-circular recess in thecircumference of i moved into registration with the said recess or thestop disc I! and is passed through this re'- cess of the stop disc I! byaction of its compression spring I5 (Fig. 6). During this rockingmovement of the carriage through 180 bywhi-ch the spindle 8 is carriedfrom winding position (Figure 1) to doffing position (Figure 6), the

barbed needle I4 grips, by means of the hook thereof, the thread portionpassing between the thread guide I3 to the full cop tube 8, that is, to

the stop I2, which thread portion is thus laterally defiected by thebarbed needle I4 in the manner shown in Fig. 6 to such an extent thatthe thread is moved on the path of movement of a thread catch l'9provided on the head I of the winding spindle 6 so that the thread iscaught by this thread catch and firmly clamped to the said head i byclamping action of the thread catch in order to be then wound on theempty cop tube 8'. The return movement of the frame is performed bymeans similar to that disclosed in my U. S. Patent No. 2,131,1 3?wherein it comprises particularly draw spring l9.

Due to the tension set up in the thread, owing to the winding spindle 6carrying the full. cop tube 8 continuing rotating by inherent kineticenergy, the thread is broken between the two spools 8, 8', whereby thecomplete winding provided with a terminal winding may be disconnectedfrom the head 1 of the spindle. The cop supporting frame then movesagain from its initial winding position (Figure 6) to a position towardthe right during which motion the needle I4 is also carried toward theright and comes to bear on the abutment IS. The full cop tube 8 insertedin the driving head of the winding. spindle 6 is then interchanged foran empty cop tube, whereupon the cycle of the operations explained isrepeated.

In the end period of the operation for winding the cop tube 8'- forefiecting the terminal winding the thread guide [2' is renderedeffective and during the subsequent half turn of the cop supportingframe the barbed needle M deflects the thread laterally so that it iscaught by the thread catch 19 of the head 7 of the winding spindle B,then moving into winding position, and is secured to said head,whereupon the thread is wound onthe empty cop tube having been insertedin this head.

The hook-like thread guides l2, l2 arranged on the thread holding deviceHi may be of more or less length or be adjustable in order to providefor effecting the terminal winding at a point of the cop tube asdesired.

The spindle driving heads hereinafter described are provided with aclamping element which is urged against a counter surface by action ofcentrifugal force while the cop tube rotates, for the purpose ofretaining the threadhaving been inserted between the clamping elementand the counter surface at the time of the interchanging of cop tubes,which retaining effect endures until the cop tube stops moving.

By this means the result is obtained without any further provisions thatwhen the complete- 1y wound, stopped cop tube is released from itsmounting means it drags the thread end having been kept back at theplace of clamping along so that no thread waste is retained at the placeof clamping and this place is therefore free from thread waste at alltimes. Consequently, the completely wound cop tube is in no wayprevented by the thread material, that is, thread waste, from moving outof engagement with the mounting means thereof, there being thus no riskof the cop tube getting stuck.

Figs. 9 to 12, different views of a spindle driving head are shown,which head for the purpose of fastening the same to the winding spindle6 (Fig. 13) is provided with a bore 24 in an. inner partition wall 23thereof (Fig. 12).. The hollow space 25 of the spindle driving head isprovided with a holding device for the reception of cop tubes 8, 8'respectively (Figs. 12a andlB) The space 25 of the spindle driving headis provided at the respective end with an enlargement 2'? in which acurved leaf spring 28 is arranged one head Ia by means of a screw. 29and the other end carries a weight 39 on the inner side thereof. Whenthe spindle head is at rest, the correspondingly curved leaf spring 28assumes a position as shown in Figs. 11 and 12. In this position, the

leaf spring 28 recedes for the major part of its length toward the freeend thereof from the wall enveloping the enlargement 21. This wall isprovided at its front end with a recess 3i extending over a certaincircumferential length, one circumferential end of which recessterminates in a slot catch 3| for the thread. A prong 552 limiting thisslot towards the 'front end of the wall is somewhat deflected outwardlyfrom the remainder of the wall, enveloping the space 2?, as shown inFigs. 10 and 11. In Fig. 12a, which shows a cop 8 in the winding head laand th winding head mounted on the winding spindle ii, the spindle 6 isrepresented as being supported in ball bearings in bearing support headat on face plate I. Inside, the head la is provided with a spring 28 andalso a holding device comprising an insert 52 of hard rubber having aconical bore for receiving the end of the cop tube. This insert 52 liesagainst an intermediate disc 5-3 of such thickness that the foot of thebobbin lies in spindle head la at such depth that the winding threadwill lie at the proper position at the beginning of the windingoperation. The disc 53 is exchangeable for discs of different thickness.

machine, the spindle driving head is turned in the direction indicatedby the arrow in Fig. 10,

the leaf spring 28 weighted at its free end swingsoutwardly over thefull length thereof, by actionof centrifugal force, onto the wallportion of the; spindle driving head enveloping the space 2'? allaround, as shown in Fig. 10. In this way the re cess 3| provided in thiscircumferential wall portion is bridged for acorresponding width, thatis, limited at the front side, by the leaf spring 28 which, however,does not extend all the way up end of which is connected to the spindledriving to the front end of the spindle driving head la,

If thereupon .the winding thread 33 is brought within the range of thespindle driving head Ed by being accordingly deflected laterally (asregards the course of the thread), so that the thread is caught by theprong 32 acting as a thread catch and is moved along the slot 35 bymeans of this rong, the thread then comes to lie be tween the leafspring 23 and the wall of the spindle driving head where it is clampedsufficiently in order to be subsequently directed over to the empty coptube inserted in the spindle driving head and to be wound thereon. Inclamping the thread between the leaf spring 23 and the wall of thespindle driving head la the thread is cut by effect of the thin and thussharp outer edge of the leaf spring 28 and is thus severed from the fullcop tube.

As shown in Fig. 13, the full cop tube 8 is moved out of windingposition by effect of the rocking movement of the cop supporting frameand an empty cop tube 8' is moved into this position. During effectingthis operation of interchanging cop tubes the barbed needle it, whichhas been accordingly controlled in automatic manner, has moved. thewinding thread with.- in the range of the spindl driving head '50. onthe winding spindle 5. Since this winding spin dle 6 is driven in theposition. of the cop sup-- porting frame shown, the winding threadarriv. .ing from the thread guide is is subsequently;

When, during the operation of the winding caught by the prong 32 of thespindle drivin head, whereupon the thread is severed.

After the winding spindle concerned has come to rest on the completionof the winding and the subsequent operation of interchanging cop tubes,the leaf spring 28 assumes its condition of inoperation again in whichthe clamping action between the leaf spring 28 and the wall of thespindle driving head 1a serving as a count-er surface therefor, in anamount as required for retaining the corresponding thread portion,ceases. In consequence thereof the thread which previously had beenretained by the leaf spring 28 can be pulled out of the spindle drivinghead without any further provisions by the full cop tube, when thelatter is released from engagement with the bearing means thereof.

Therefore, the thread is not retained in the spindle driving head sothat no thread waste can accumulate in the latter. This makes itpossible, on the other hand, to effect a smooth delivery of the threadto the clamping point of the spindle head and a more secure attachmentand of securely clamping threads of any size varying between thethickest and thinnest threads.

In the example shown in Figs. 14 to 16, into an outer circumferentialgroove 40 of the spindle driving head 1b is inserted an open ended ring4| which is provided at one end with a projecting arm 42 serving as athread catch. As evident from Figs. 15 and 16, the portion of the ring4| adjacent the end thereof which forms the thread catch bears closelyagainst the spindle driving head for a distance of over half thecircumferential length, whereas concerning the remaining portion of thecircumference. of the ring 4|, clearance is provided between the rin andthe spindle driving head 1b, in consequence whereof it is evident thatthe bearing of the ring 4| against the spindle driving head 1b isnon-uniform to a corresponding extent. This unequal bearing engagementbetween the rin 4| and the spindle driving head 1?) is maintained due toa consequent weight distribution of the ring 4| by action of centrifugalforce, when the spindle driving head rotates, so that as the windingthread is caught by the catch arm 42 of the ring 4| it is clampedbetween the ring 4| and the spindle driving head, whereupon theoperation of severing the thread arriving from the full cop tube takesplace.

After the spindle driving head has come to rest, on the completion ofthe winding and the subsequent operation of interchanging cop tubes,

and thus stops turning, the ring 4| is urged against the spindle drivinghead 1b merely by action of its ownweight and thus no longer withconsiderable force, so that the thread which is then retained by thering only slightly can easily b pulled off the spindle driving head 11).1

In the examples hereinafter described-by talcing reference to Figs. 17to 23, the spindle driving head is provided with a rigid clampingelement which during the operation of thewinding 7 machine is moved byaction of centrifugal force from inside to outside, due to beingcorrespondingly arranged, whereby it is urged against the countersurface. J

By this means, the result is obtained that with the aid of simple,altogether unsusceptiblemeans which warrant a reliable operation in thelong run the thread can be temporarily retained.

In the example shown in Figs. 17 to 19, in the enlargement 21 of thespindle driving head 10 a rigid arcuate wing 43 is pivotally mounted bymeans of athreaded stud 44. When the spindle head does not rotate,thewing 43 assumes, for example, a position as shown in Fig. 19. In thisposition the wing 43 bears with its reduced end adjacent the threadedstud 44 against the cir-; cumferential wall limiting the enlargement 21,whereas the remaining part of the wing recedes over its full lengthinwardly away from the said circumferential wall.

As the winding spindle provided with the spindle driving head is rotatedin the direction of the arrow indicated in Fig. 18, the wing 43 swingsby action of centrifugal force from inside to outside, so that it bearsagainst the inside of said circumferential wall over the major part ofits length, as indicated in Fig. 18. In this way the recess 3| providedin the circumferential wall is bridged, that is, limited at the frontend by the wing 43 for the width of the same. If then the winding thread33 is so moved within the range of the spindle driving head 10 by beingaccorde ingly deflected by means of the barbed needle I4? that it isgrasped by the prong 32 serving as a thread catch and is moved by thelatter along the slot 3|, the thread then comes to lie between the wing43 and the wall of the spindle driving head. In this position the threadis clamped fast enough so that it is automatically torn between thespindle driving head and the still ro tating full cop tube, aspreviously described.

After the winding, spindle has come to rest on the completion of thewinding and the subsequent operation of interchanging cop tubes, thewing 43 which is then influenced merely by its own weight is in noposition of rotation of the spindle driving head urged against thecounter surface presented to the ring by said head with suflicientpressure for exerting the necessary clamping effect for retaining thethread between the wing 43 and the said counter surface.

In th example shown in Figs. 20 to 23, in the enlargement 21 of thespindle drivinghead 1d a bi-partite ring 45, 46 is arranged, so thatthe, ring portion 45 is fixed to the spindle head 1d,- whereas the ringportion 46 is loosely inserted therein. The two ring portions 45, 46 areformed from an initially closed ring of a diameter corthe diameter ofthe original ring, that is, the en-i largement 21 inside the spindledriving head 1d.- by an amount which corresponds to the radial clearanceof the loose ring portion 46 withinthe enlargement 21. The two ringportions 45, 46, are arranged in the spindle driving head id in regardto their oblique end faces in such mannerthat the fixed ring portion 45prevents the ring portion 46 loosely inserted in the spindle driving;head 1d from dropping out of the spindle driving head in the axialdirection.

When the'winding spindle providedwith the spindle driving head begins torotate, the ring 7 portion 46 loosely inserted in the spindle drivingyhead is moved from inside to outside by action of centrifugal force sothat it comes to bear on the inner circumferential surface of theenlargement 21 which serves as a counter, surface'forthis portion, asshown in Fig. 21. Thereupon,

the winding thread is introduced in the slot 3|? between the ringportion 46 and the prong 32,- that is, the wall of the spindle drivinghead 1d,'- during the operation of interchanging cop tubes.

at the winding position, and is clamped fast between these parts. In thecondition of rest of the winding spindle, the ring portion 46 isinfluenced merely by action of its own weight, so that it is urgedagainst the counter surface presented to it by the spindle driving headin no position of rotation of the latter with an amount of pressuresu-filcing for exerting th required clamping effect for firmly retainingthe thread. The thread is finally pulled out of the spindle driving headby the completely wound cop tube being released.

Instead of a ring portion fixed to the spindle driving head, other kindsof stop means may be provided on the spindle driving head for the loosering portion acting as a clamping element, so as to limit the movementof the last named ring portion in the radial and axial direction of thecop tube.

I claim:

1. In a thread transfer mechanism for cop winding machines having aslidable, rockable carriage, a plurality of spindles mounted in saidcarriage, a thread catch on each spindle, a barbed needle adjacent eachspindle mounted longitudinally slidably in said carriage, a thread hookadjacent an end of each bobbin mounted on the carriage for retaining thethread during movement of a full bobbin from winding to non-windingposition during a rocking movement of the carriage, and means for movingthe barbed needle corresponding to a spindle having a full bobbin totransfer the thread to the catch of a spindle having an empty bobbin.

2. In a thread transfer mechanism for cop winding machines, a rockable,slidable spindle carriage, a plurality of spindles mounted in saidcarriage, each of said spindles having a bobbinretaining head and eachhaving a thread catch adjacent its head, a hook on said carriageadjacent the last portion of each bobbin to be wound, a barbed needleadjacent each spindle and bobbin, means for moving said needles totransfer the thread being fed from a full bobbin, after rocking of thecarriage, to the thread catch of a spindle having an empty bobbin, whilethe thread hook adjacent the end of the full bobbin retains the threadin line with the last end of said full bobbin to be wound during saidtransfer.

3. In a thread transfer mechanism for cop winding machines having aslidable, rockable carriage, a plurality of spindles mounted in saidframe carriage, each spindle having a bobbinretaining head at one end,and each having a thread catch at said end, a plurality of counterbobbin holders mounted on said carriage at positions opposite thespindle heads, a guide hook adjacent each counter holder, barbed needlesmounted in said carriage adjacent said spindles, a coil spring on eachneedle, an abutment for the ends of said needles, a stop for the ends ofsaid needles, said needles successively cooperating with said abutmentand stop according to the longitudinal and rocking ositions of thecarriage, the ends of said needles engaging said abutment during windingoperations and during the greater part of the rocking movements untilthe end of the rocking movements when the end of a needle passes out ofalignment with the abutment and under the influence of the spring movinglongitudinally into engagement with said stop, and during saidlongitudinal movement the barbed needle transferring the thread to thethread catch of a spindle having an empty bobbin.

4. In a thread transfer mechanism for cop winding machines having aslidable, rockable carriage, a plurality of spindles mounted in saidcarriage, a thread catch on each spindle, a clamping device on eachspindle adjacent the thread catches thereof, said clamping devicecomprising a resilient jaw having a weight responsive to centrifugalforce and an opposed clamping surface, said clamping device acting tohold the thread during rotation of the spindle and release the threadwhen the spindle ceases to rotate, a barbed needle adjacent each spindlemounted longitudinally slidably in said carriage, a thread hook adjacentan end of each bobbin mounted on the carriage for retaining the threadduring movement of a full bobbin from winding to non-winding positionduring a rocking movement of the carriage, and means for moving thebarbed needle corresponding to a spindle having a full bobbin totransfer the thread to the catch of a spindle having an empty bobbin.

5. In a thread transfer mechanism for cop winding machines having aslidable, rockable carriage, a plurality of spindles mounted in saidcarriage, a thread catch on each spindle, a clamping device on eachspindle adjacent the thread catches thereof, said clamping devicecomp-rising a resilient leaf spring having one end secured to thespindle and having a weight mounted thereon responsive to centrifugalforce and an opposed clamping surface, said clamping device acting tohold the thread during rotation ofthe spindle and release the threadwhen the spindle ceases to rotate, a barbed needle adjacent each spindlemounted longitudinally slid-ably in said carriage, a thread hookadjacent an end of each bobbin mounted on the carriage for retaining thethread during movement of a full bobbin from winding to non-windingposition during a rocking movement of the carriage, and means for movingthe barbed needle corresponding to a spindle having a full bobbin totransfer the thread to the catch of a spindle having an empty bobbin.

6. In a thread transfer mechanism for cop winding machines having aslidable,,rockable carriage, a plurality of spindles mounted in saidcarriage, said spindles having heads each provided with abobbin-receiving socket and with a wide slot, a thread catch on saidhead adjacent said slot, a leaf spring in said socket having a weightand comprising one jaw of a clamp, a counter clamping jaw against whichthe spring is pressed by centrifugal force when its spindle is rotatingand from which it withdraws when not rotating, a barbed needle adjacenteach spindle mounted longitudinally slidably in said carriage, a thread

